require "./spec_helper"

describe Array do
  describe "#union" do
    it "works with no elements" do
      ([] of Set(Int32)).union.should eq(Set(Int32).new)
    end

    it "correctly performs a union" do
      [Set { 1 }, Set { 2 }, Set {1, 2, 3}].union.should eq(Set { 1,2,3})
    end
  end

  describe "#intersect" do
    expect_raises(Enumerable::EmptyError) do
      ([] of Set(Int32)).intersect
    end

    it "correctly performs an intersection" do
      [Set {1}, Set {1,2}, Set {1,2,3}].intersect.should eq(Set{1})
    end
  end

  describe "#zip_with" do
    it "performs as expected" do
      [1,2,3].zip_with([2,3,4]) { |l,r| l*r }.should eq([2,6,12])
    end
  end
end